ConvertGPUToSPIRVPass.cpp
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//===- ConvertGPUToSPIRVPass.cpp - GPU to SPIR-V dialect lowering passes --===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements a pass to convert a kernel function in the GPU Dialect
// into a spv.module operation
//
//===----------------------------------------------------------------------===//
#include "mlir/Conversion/GPUToSPIRV/ConvertGPUToSPIRVPass.h"
#include "../PassDetail.h"
#include "mlir/Conversion/GPUToSPIRV/ConvertGPUToSPIRV.h"
#include "mlir/Conversion/SCFToSPIRV/SCFToSPIRV.h"
#include "mlir/Conversion/StandardToSPIRV/ConvertStandardToSPIRV.h"
#include "mlir/Dialect/GPU/GPUDialect.h"
#include "mlir/Dialect/SCF/SCF.h"
#include "mlir/Dialect/SPIRV/SPIRVDialect.h"
#include "mlir/Dialect/SPIRV/SPIRVLowering.h"
#include "mlir/Dialect/SPIRV/SPIRVOps.h"
using namespace mlir;
namespace {
/// Pass to lower GPU Dialect to SPIR-V. The pass only converts the gpu.func ops
/// inside gpu.module ops. i.e., the function that are referenced in
/// gpu.launch_func ops. For each such function
///
/// 1) Create a spirv::ModuleOp, and clone the function into spirv::ModuleOp
/// (the original function is still needed by the gpu::LaunchKernelOp, so cannot
/// replace it).
///
/// 2) Lower the body of the spirv::ModuleOp.
struct GPUToSPIRVPass : public ConvertGPUToSPIRVBase<GPUToSPIRVPass> {
void runOnOperation() override;
};
} // namespace
void GPUToSPIRVPass::runOnOperation() {
MLIRContext *context = &getContext();
ModuleOp module = getOperation();
SmallVector<Operation *, 1> kernelModules;
OpBuilder builder(context);
module.walk([&builder, &kernelModules](gpu::GPUModuleOp moduleOp) {
// For each kernel module (should be only 1 for now, but that is not a
// requirement here), clone the module for conversion because the
// gpu.launch function still needs the kernel module.
builder.setInsertionPoint(moduleOp.getOperation());
kernelModules.push_back(builder.clone(*moduleOp.getOperation()));
});
auto targetAttr = spirv::lookupTargetEnvOrDefault(module);
std::unique_ptr<ConversionTarget> target =
spirv::SPIRVConversionTarget::get(targetAttr);
SPIRVTypeConverter typeConverter(targetAttr);
ScfToSPIRVContext scfContext;
OwningRewritePatternList patterns;
populateGPUToSPIRVPatterns(context, typeConverter, patterns);
populateSCFToSPIRVPatterns(context, typeConverter,scfContext, patterns);
populateStandardToSPIRVPatterns(context, typeConverter, patterns);
if (failed(applyFullConversion(kernelModules, *target, patterns)))
return signalPassFailure();
}
std::unique_ptr<OperationPass<ModuleOp>> mlir::createConvertGPUToSPIRVPass() {
return std::make_unique<GPUToSPIRVPass>();
}